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Carsomyr was a powerful two-handed holy avenger sword found in Firkraag's "hoard" in his subterranean lair within the realm of Amn.
Described as one of the most powerful weapons existing on Faerûn, the blade was technically a +5 two-handed sword (greatsword) that granted magic resistance when wielded.
This powerful sword could be used to cast dispel magic. Carsomyr was extremely devastating to chaotic evil opponents and also dispelled their magic whenever it hit.
In Baldur's Gate II: Throne of Bhaal, Cespenar could combine Carsomyr with the Eye of Tyr to make it a +6 weapon.
Carsomyr article at the Baldur's Gate Wiki, a wiki for the Baldur's Gate games.